Bently
View products
Product image is representative; revision or series may vary. Contact us to request a specific version.
Get a quick price for MVME133A-20
For more information on how your data is processed and stored by Apterpower please read our privacy policy
-
Match the complete marking
Include MVME133A-20 and every visible revision or serial identity in your enquiry. Keep the same complete reference on the quotation. -
Check the offered item before ordering
Request available label and connector photos. Have your maintenance team compare the offered MVME133A-20 with the installed equipment and applicable Motorola documentation.
Technical specifications for MVME133A-20
-
Manufacturer:Motorola
-
Product Category:General Automation
-
Spare Part Number:MVME 133A-20
-
Weight:0.5 kg
-
Tariff Code:8537101190
-
Microprocessor:20.0 MHz MC68020
-
Board class:32-bit VME monoboard computer
-
Local DRAM:1 MB onboard MVME133A architecture
-
Floating point:MC68881 coprocessor in MVME133A architecture
-
VME interface:A32/D32
-
Serial channel A:RS-485/RS-422 configurable
-
Serial channel B:RS-232-C, jumper-selected DCE or DTE
-
System controller:Jumper-enabled VME controller functions
-
ROM sockets:Four 28-pin sockets in two banks
-
Power requirement:+5 V, 5 A typical; 7 A maximum, plus ±12 V rail provision
Information
Overview
Downloads
Applications / Compatibility
Product Precautions
- The MVME133A-20 combines a 68020 processor with local memory and VME control on one legacy VME board.
Configuration capture: note controller jumpers
Serial check: map both electrical standards
Socket check: record programmed ROM devices
System proof: test bus and terminal paths
Serial check: map both electrical standards
Socket check: record programmed ROM devices
System proof: test bus and terminal paths
Motorola identifies the -20 execution by its 20.0 MHz MC68020 processor. The MVME133A design also places local DRAM, a floating-point coprocessor, ROM sockets and serial interface hardware on the board, supporting an embedded host without assuming a particular field application.
The serial channels differ electrically: one supports RS-485/RS-422, while the RS-232 channel can be strapped as DCE or DTE. Their signal access and the board controller functions depend on the original jumpers and P2 cabling; capture those settings before removing the installed module.
The A32/D32 VME interface allows the board to participate in chassis transfers and, when enabled, system-control duties. Return-to-service testing should cover processor startup, local memory, both used serial paths and the actual VME transactions expected by the machine.
The serial channels differ electrically: one supports RS-485/RS-422, while the RS-232 channel can be strapped as DCE or DTE. Their signal access and the board controller functions depend on the original jumpers and P2 cabling; capture those settings before removing the installed module.
The A32/D32 VME interface allows the board to participate in chassis transfers and, when enabled, system-control duties. Return-to-service testing should cover processor startup, local memory, both used serial paths and the actual VME transactions expected by the machine.
Controller platform reference: Motorola MVME133A VME computer. Preserve jumper settings.
Technical downloads for Motorola MVME133A-20: selected original Motorola pages and a product-specific installation guide.
-
Motorola MVME133A-20 technical reference
Original Motorola pages - PDF, 4 pages. Motorola Microcomputer Systems and Components, 1987, MVME133A data and ordering entry; MVME133 User Manual. -
Motorola MVME133A-20 installation guide
Prepared by Apter Power - PDF, 3 pages. Model-specific installation, electrical checks and commissioning review.
The technical reference preserves selected original Motorola pages. The installation guide is prepared by Apter Power; confirm the installed revision and site requirements before work.
Legacy host position: MVME133A-20 serves a 20 MHz 68020 VME system whose ROM image, address map and chassis-controller plan match this board.
Interface boundary: RS-485/RS-422 and RS-232 channels require different cables and configuration; an existing connector shape does not prove signal compatibility.
Interface boundary: RS-485/RS-422 and RS-232 channels require different cables and configuration; an existing connector shape does not prove signal compatibility.
-
VME host processing
Run the original MC68020 software and access VME slave modules under the recorded address and interrupt map. -
Multidrop serial communication
Use the RS-485/RS-422 channel only with the correct line topology and master/slave setting. -
Service terminal
Use the RS-232 channel with the required DCE/DTE strap and cable pinout. -
System-controller duty
Enable VME arbitration and reset functions only in the chassis slot assigned to controller service.
The 1987 board relies on physical configuration; record jumpers, socketed devices and cable pinouts before an exchange.
Chassis isolation
Remove power and use ESD protection before touching the board or ROM devices.
Supply capacity
Verify +5 V and auxiliary rails against the catalog board load and the complete chassis budget.
Serial jumper map
Copy DCE/DTE and RS-485 operating mode selections from the working installation.
ROM devices
Record installed socket identities and orientation before moving any programmed device.
Controller role
Match SYSRESET and arbitration jumper configuration to the system-controller plan.
Functional checkout
Prove processor boot, local DRAM, VME traffic and each used serial channel with the host application.
Alternative Names
Motorola MVME133A-20
MVME 133A-20
Motorola MVME 133A-20
Technical notes
Serial wiring: Channel A and B use different electrical standards. Verify P2 wiring and DCE/DTE jumpers against the installed cable before energizing communications.
VME role: System-controller functions are selected by board jumpers; retain the chassis arbitration and SYSRESET arrangement.
Technical reference: Motorola Microcomputer Systems and Components, 1987, MVME133A ordering and specifications, with MVME133 User Manual for board-level configuration.
FAQ View All FAQ
-
Why is the -20 suffix significant on MVME133A-20?Motorola uses it for the 20.0 MHz MC68020 version. Preserve the suffix when selecting software timing assumptions or replacement stock.
-
How should RS-232 cabling be selected for MVME133A-20?Check whether the board is strapped as DCE or DTE, then compare the installed P2-to-connector cable against the board pinout before connecting a terminal.
-
What does the RS-485/RS-422 mode change on MVME133A-20?Master/slave and duplex choices alter how the serial channel participates on a shared line. Restore the recorded mode and termination scheme.
-
When should MVME133A-20 provide VME system-controller functions?Only when the original chassis design assigns that board the controller role; verify the enabling jumper and arbitration plan.
-
Why should ROM sockets be inspected during MVME133A-20 exchange?The board can carry application or boot code in socketed devices. Record each device and orientation so a replacement does not start with an unrelated image.
-
How should a memory fault be isolated on MVME133A-20?Run local diagnostics and inspect the onboard DRAM and power rails before attributing a failure to VME peripherals.
-
What VME checks follow installation of MVME133A-20?Confirm the A32/D32 address map, interrupts, bus arbitration and transfers used by the installed application.
-
What proves MVME133A-20 is ready for service?Boot the intended ROM image, pass local memory tests, exercise both configured serial paths and validate the machine VME transaction sequence.
Manufacturers
Supporting new and legacy automation
Whether you're maintaining existing equipment or sourcing parts for current systems, we provide fast, dependable supply you can rely on.
-
Please try to be as accurate as possible with your search.
-
We can quote you on 1000s of specialist parts, even if they are not listed on our website.
-
We can't find any results for “”.
PRODUCTS IN SEARCH PAGE ()
50+ account managers available now
Related reading
Related cases and sourcing guidance
View all case studies
Manufacturers
You May Also Like
Explore related automation components available through Apter Power.
Manufacturers
Product Browsing History
Revisit the products you recently viewed on Apter Power.
SPEAK TO OUR TEAM
Let’s find the right solution for you.
Send us the part number, quantity and delivery destination. Our team will help confirm availability and lead time.
-
Whatsapp: +86 18030235313
Send us a message. -
sales13@apterpower.com
Complete our online form. -
+86 18030235313
Speak to our team in your native language.